横向
1
Largest ocean on Earth
4
Area where water covers the soil
6
Large area covered with trees
9
Low area between mountains
10
Wearing away of land by water or wind
纵向
2
Land surrounded by water
3
Land surrounded by water on three sides
5
Ridge of rock or coral near the surface
7
Chain or group of islands
8
Large natural stream of water
11
Flat grassland in tropical regions